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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e57881c286d37846e8e563788419d86ad0eaa56cbf22acbaaf9dd32c0a0361' 
  AND token = 'GbHaESVmr8vpW2CpQ6HdhSFsfoepxOaMXa5BmPpiA3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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