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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d06df5e462431152afe616fb497c83b5077b33f8589fd73f064558e99802444' 
  AND token = 'om1QVJd8qQPqNH2C0gU220pXC4y3Q9mayifB2Ba4LPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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