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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15afa7efd76338de369cbfa53dbace802c4aba83996ca7f56c6876a4a398caf' 
  AND token = 'noYzIw5y4eiSURpARiPLp/h93/Uzbi+32s5GXQsbz3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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