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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235c283dd3750c22407a9d09dd10d42c9942b9ea0b7d231d11215e6854534713' 
  AND token = 'xmrmzGkHIO30FN2YnwcWsXq1whBOumGLh0A+VOSc2jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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