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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c41974cb5a67601c2bbb34f0e6a0a1a4283125238f219fca90593e4eea048ce' 
  AND token = 'C4RkWwZZL9VNl2gXasNiH3r5ct1xfVJVoS8VXR+lRlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}