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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad30e71ae3d886efa88426930d587f3f9a83804309d01dcaf7f83f19f3013063' 
  AND token = 'YmrGePKGH3+vOndZM7pFI4UvHBmsEhd+0SaU4RF/gdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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