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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7948de17740c8d520f72276916bc9e54a6a24817996cfe54e913ed292ba4d1' 
  AND token = 'QR/sWR9EoQaATY+pIpNaIsg1M/N5q2OgEttgqz/hHsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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