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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a371babcc8a2bba2f11e1aad9cc247f7788d0cb1b0710af4bada403f332dd5e' 
  AND token = 'bbwZ5dckCOiIEIKJUNhX9Gdbc9wq0fUQDSH4JHgTdys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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