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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcbff4b7b685c5f0df88229b687e658e1376dbd95fc296268ffe3db15a253cc' 
  AND token = 'IaBBp7Ac3v69qgxkUpvH2caM9/SnabBGmpclfpXpd2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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