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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd782c4cf4c15629d7602ce598222604fdce4a382ada74bfa546701912dcd1c42' 
  AND token = 'aRA2s8TiPWrKJxBfSABySb2kBgqN1Loy9sLlQ5Hp5xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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