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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a007ba5db4927c96d0728e42b78f982140ee92a03ef09a6d82d22b8b8ed3aead' 
  AND token = 'OIJbxngQgiIzLpU/hrJHIz49HIVOab5NoGARVMsYYwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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