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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9fbd3801a39091d794b571bf3597f4fbc37b1f1af063080c746f499af61b18' 
  AND token = 'i2M9nbhSypsJ7mTsxm2i9ebOJlHfiFzHi6KqJ0OL3OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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