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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170a21980daf08d0f89cc4e3cc0f825f4ebd1d0abcd0611bd61fd15b2cdba3de' 
  AND token = '6X+143Slh2AReyL1VkO49YF6IDBKOOqM6FVyKcwmQug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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