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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31822cfb02242522c86c531451b37ffa83f3c6181a021e38510e9c9c68eeaca' 
  AND token = '2V3nzFqwcvDzgt0o1ivtw7esaSdn7mGFi/I4liWbBQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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