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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa7ef6588e67ebcbfbd672bb47169e5cb9f7926a0496dbd87aa28958fbf9cc0' 
  AND token = 'R1IR93pe/NtBTDF77S30tNpSMq7AHibzSq15aXwm3Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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