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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d3540e6678bc68ab0d09e3b962d4df57c397aa05c29cba01e2517f5ddf5678' 
  AND token = 'H8sfFmsw5Hm11VbFCEX2ysRiImbCoPfNE2VEb5dEECc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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