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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c6f1077887d02bd01cc73d8ed705cfcc58150c6b53151bc6f226400c5f9ff1' 
  AND token = 'ppyPdib+sFMA4x7gIqnB7RF9O/VtpI03Zos10+Nytx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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