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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1793a2a54b40dfcfb205104453e105f99c0d6f953e2acec8330a9113f94e6e8c' 
  AND token = 'fmXoK5nfEMV8zhDQpumMYfJSzenKnShlNL6SZ+1+du8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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