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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7181e15b39657038da09523d6b0b2f08ccf7c7afe31952254ce250a8c3bbfb21' 
  AND token = 'FS64SugSCGohtP7dHyN3cKqe/F2IpCrZQijejfLNpl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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