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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed0ef47753aecba018b242fbec427de74f07a9cc208fad9e9b2ab1475f1d14c' 
  AND token = 'Db4AyN8vlBLSgoxqt33BJKojspvPg2azijsz2wA5pUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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