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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfccab3fab97c8d6950661b284d30018934341bc5d40b273c2ef591eb9d67603' 
  AND token = 'm4oodQWw6O8QiVwPNouSI5h7gS9Ua83pcW8+imqBnkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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