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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a696469d55ddc7bfa42c38274fc399d3a46789fc6686ff5e0458a99c8daf79b0' 
  AND token = 'xBDluXDt+O821Se9AVKib8vbGw08O3BU3uo4qS7NrFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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