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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec04fb613f3e20a77ca885152d29fc6553f32adad5b76343f3e545190bf33bb' 
  AND token = 'wyRzIkqx7OEijbFAW0zx4glJO0Udu7+m8voh8g9jpNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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