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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf555d794a289291da4aa073c73a6bc296a3f8c8141f60fad8a3f1874957ad3' 
  AND token = '13z72+q28tVB+o15nDXr2ejwb/04QeKDeq3+vTy1Kp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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