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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca848edeb944cd35e0591bf1e5453e0be9cc9db6c85bc9bb64548b3b1d3a35b' 
  AND token = 'rahyQa3/pis1IeabHm6k2TqyVMyXk4w24l2aNirkBCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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