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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d18c34eae5e249f0ff05d49db4447de8ee311cbd59a21ba05701eafa86aca8e' 
  AND token = 'lj9zYbeq2njRDkQnWW3B6a6DmV/eCQE7MUYLjyrTE8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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