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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f65930b95170809504412e2026c289edff95a7b857d918d8cb5c31900c7353' 
  AND token = '6TBAcP0s3mPWGLtAv6tNhD88/MFHy/0EFEIa0d0xbmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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