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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc932309d38bcc447e6dfcfbaf05a84cffb8c3eb99adcaf7d70d061bf12b887' 
  AND token = '4L+HkU1LGZCq1NDeXZGT9kuJTs5ecD00s1LGeeLff70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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