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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09197636cb8d8f47b9b7c7bc4ea75577be46db407cd51e51c68894ff179d7d3f' 
  AND token = 'm1kkvcy4Iw7jS+A/55JglCfAAk7JNjyEPLciOews8DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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