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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97647b3a2d99b7d1aa73a0381d205f24a36a06a763432a5612dfb0412426d715' 
  AND token = 'Fs2TIPJ6V0CAfh8U42XYNkW0aoKA8/sgoKtY7HcNHnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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