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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23450478a6b831d318130c5f5889320c5eeea1df11301f1fb432059f748022e' 
  AND token = '0F2w4k2BGLqQHXcyjAQnkO4+rQ9wn+MbHYNdzW6Ot1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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