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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc996342f0918434d3d6c4c754f0b19cebe32c16459fbe1ad8832e5c9d7bae1' 
  AND token = 'XguH0vz2Stbu0oVfGqx55SSoQrFjEuZX+9hyf61N9rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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