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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40d3aeb74d3cb1310c45391a492f41fcf844f0790eb03bb3a2384a9d67f11d9' 
  AND token = 'nG5k01SQ6ev4FDltOK1FaCRmMGhWnbk129yPi4NXVT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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