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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2188ea41408afee306dbc628bec83b8057a1d0da006141bc380437d68c365472' 
  AND token = 'OywjfOUs+Q2QR7GR3yz5pn8kDgM6nDu4NcgiFefL6hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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