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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca5e843edd71a9b278da37899ea6d65c061bdf5dbf4ca2370cd5738f393a4bd' 
  AND token = 'FRySClL2ute251u65pBs7Re7E1j4ldOahqUsaK5gmgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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