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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06592b5a5a44281a3303b51ce2366964d43eec9ab111b63fdfa82d0db752ea65' 
  AND token = '2p+TaHjnJBWnO+mRA44xo3i0JeQRBfXV+iSCUHgTFSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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