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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a674d35d7776a5dc7ed41288b45a8649225109a1866379fbb256d9d730ed599d' 
  AND token = 'a+awdzFAibhLdN28YcstOAfJ6JQT9fVBs40KveAOT54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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