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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7969656570a01512e27090f389663c077f3442e6b0a64433f0689ebcac8d45ce' 
  AND token = 'ZFbMpKdfRpE3iPdlOEVBTkdWeUa024S993JIVPAviFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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