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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9896450381a64e92552a2c7dea00abd16a5d99dbc52b651caf9da9dc458d05f0' 
  AND token = 'oluH6ViS/Kn9tZQ0MVPmmDrMvo0fCA2OeRbN0vbe3vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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